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US 8,138,662 B2Granted
Electrode for a discharge lamp
AssigneeOSRAM GmbH
InventorAdam Kotowicz
Life of this patent
Estimating the term…
Abstract
An electrode for a discharge lamp (I) with a core (11) and a sheath (12), which surrounds at least regions of the core (11). The sheath (12) has, in the longitudinal direction (A), a continuous bore (121), which has a first diameter (d1) in a first subregion and a second diameter (d2) in a second subregion.
Claims9
An electrode for a discharge lamp with a core and a sheath, which surrounds at least regions of the core,
- wherein the sheath has, in the longitudinal direction, a continuous bore, which has a first diameter in a first subregion and a second diameter in a second subregion,
- wherein a transition of the bore from the first diameter to the second diameter has a stepped design,
- wherein the bore in the sheath has a smaller diameter at the end facing the discharge space than at the end remote from the discharge space,
- wherein the core comprises a base which is arranged in the sheath and has a larger diameter than the smaller of the first diameter and the second diameter,
- wherein the entire core is formed from a same thorium-doped material, and
- wherein an electrode holder extends into the subregion of the bore with the larger diameter.
3 more elements
Dependencies are inferred from the claim text.